Ok, I tried the VGA cable. Looks like everything is working ok. When I tried to install the driver I could not see it on the list in my ViewSonic folder (where they said it should be). But when I tried to install it from where I downloaded the driver, it said it was already installed.
And I found that my DVI cable is actually a HDMI (at the pc) to a DVI (at the monitor). I didn't notice that before because I didn't change the cable, I re-used it without looking at the pc end.
I would like to use the DVI cable but I am thinking its not going to work unless I figure what is wrong with that connection.